Globe-tester.



. GLOBE TESTER.

APPLICATION FILED MAR-$1903.

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aqbby No. 301,412. PATENTED OCT.- 10, 1905. H. 0. SPINNBY. GLOBE TESTER.

APPLICATION FILED MAR-3.1903.

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HENRY CLINTON SPINNEY, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERALELECTRIC COMPANY, A CORPORATION OF NET/V YORK.

GLOBE-TESTER.

Specification of Letters Patent.

Application filed March 3, 1903. Serial No. 145,919.

Patented Oct. 10, 1905.

To all whom, it may concern.-

Be it known that I, HENRY CLINTON SPIN- NEY, a citizen of the UnitedStates, residing at Lynn, county of Essex, State of Massachusetts, haveinvented certain new and useful Improvements in Globe-Testers, of whichthe following is a specification.

This invention relates to a device for testing inner globes of inclosedarc-lamps to ascertain whether they are of the proper size and shape,and if not whether the variation is too great to permit of using theglobe in a lamp.

In inclosed arc-lamps the inner globe is closed at its upper end againstthe admission of air by a cap which rests upon the upper edge of theglobe and which in some types has a loop on one side extending over astationary suspension-hook. The importance, therefore, of having theglobe of the proper height is obvious, for if, for instance, it wereshort the suspension-hook would hold the cap up ofi of the globe on oneside. The cap that closes theupper end of the globe has a central borethrough which the upper carbon extends, and owing to the necessity forkeeping the inner globe almost air-tight the clearance allowed betweenthe cap and the carbon is very small. Tilting the cap so that it doesnot rest at right angles to the carbon therefore has the effect ofreducing the size of the opening through which the carbon passes. Onaccount of the small clearance between the cap and the carbon if theformer were tilted to only a small extent the carbon would get caughtbetween the sides of the opening and prevent the lamp from feeding.Furthermore, the center line of the bore in the cap must coincide withthe axis of the carbon, for otherwise the carbon would not feed or wouldbe guided out of alinement with the lower carbon. The ends of the globemust therefore be ground perfectly true and be perpendicular to the axisof the globe. If the foot or lower end is not true, the center line ofthe bore will be thrown away from the axis of the carbon, and if theupper end is not true the cap will be tilted, in either case preventingproper feeding of the lamp. I have therefore provided a testing deviceby which the height and the edges of a globe can be quickly andaccurately tested to ascertain whether or not they are true, and if notwhether the variation is too great to permit of using the globe in alamp.

In carrying out my invention I provide a frame carrying a rotatableglobe-holder, the seat of which is machined perfectly true andperpendicular to the sides of the frame. A plate is loosely mounted forvertical movement on the sides of the frame and is adapted to rest onthe topof the globe. On this plate is secured a pointer or index andwhen the plate is perpendicular to the sides of the frame the pointerregisters with a mark or datum point on the top of the frame. On eachside of the frame are three marks. The plate should register with themiddle one of these marks when the globe is of the proper height, andthe other two marks indicate the maximum and minimum height allowable.On one of the sides of the frame is a loose collar or gage. In using thedevice a globe is clamped in lace and the plate rested on the top of t eglobe. The position of the plate with reference to the marks on thesides shows whether the height of the globe is proper. The globe is thenrotated by a hand-nut attached to the globe-holder, and if the lowerfoot is not true the upper part of the globe will approach and recedefrom each side of the frame alternately. If this occurs, the gage is runup on the side of the frame when the globe is nearest that side, andunless it can pass the globe must be rejected. As the globe is rotatedthe pointer is watched, and if the upper end of the globe is not true itwill be indicated by the pointer leaving the mark on the top of theframe.

My invention therefore embraces a testing device for globes or similararticles having means for determining irregularities of height or shape.The novel features of the invention will be fully described hereinafter,and definitely pointed out in the appended claims.

In the accompanying drawings, which illustrate one embodiment of myinvention, Figure 1 is an elevation, partly in section, of the testingdevice. Fig. 2 is a top view. Fig. 3 is a section on line 3 3 of Fig. 1looking downward, and Fig. 4 is a section of part of one side of thedevice on line 4 of Fig. 3.

Referring to Fig. 1, 1 indicates the base of the frame, to which aresecured the side rods 2 2. These rods are perpendicular to the base 1and are connected at their upper extremities by the top piece 3 of theframe. Mounted in the middle of the base 1 18 a globe-holder 4, adaptedto be rotated by the hand-nut 5, the edge of which its provided with anumber of fingers, as shown in Fig. 3. The supporting-surface of theglobe-holder is machined accurately, so that it is exactly perpendicularto the side rods 2 2. A sprmgpressed stop-pin 6, having a handle 7, ismounted on the base and arranged to be pressed downwardly by a spring 8.In the bearing of the stoppin is a slot 9, into which the handle 7 mayslide. hen the handle 1s turned so that it comes over the slot, thespring throws the pin downward and its end, projecting between twofingers of the handnut 5, prevents the globe-holder from turning. Thisis necessary while securing a globe in its seat, for otherwise theentire globeholder would turn. The plate 10 is loosely mounted on theside rods 2 2, so that it can move freely up and down and tilt somewhatif the globe is not true, and at its center 1s secured an index orpointer 11. On the top 3 of the frame is a mark 12, which indicates theposition of the point of the index when the plate rests on the top ofthe globe and is perpendicular to the side rods. On each side rod arethree marks, as indicated at 13, so positioned that when the globe is ofthe proper height and the plate 1.0 is restmgon its upper end the top ofplate 10 will coincide with the middle mark. The upper and lower marksindicate the maximum and. minimum allowable height, so that if the topof plate 10 is above the upper or below the lower mark the globe must berejected. Loosely mounted on one of the side rods 2 2 is a collar Inusing the testing device a globe is secured in its seat, the stop-pin 6having first been dropped to prevent the globe-holder from turning. Theplate 10 is then placed on. the upper end of the globe. By noting theposition of the plate relative to the marks on the side rods the heightof the globe can be ascertained immediately. The stop-pin is then raisedand turned so that the handle 7 is away from the slot 9 and the globe isrotated by means of the hand-nut 5. The op erator watches the movementsof the globe in the frame, and if the side of the globe approaches andrecedes from the side rods the base is not true. By sliding the gage 14up on the side rod the crookedness of the base can be tested, for if thegage cannot pass freely from the bottom to the top of the side rod whenthe side of the globe is nearest the red the globe must be rejected. Ifthe base is true, the operator then watches the index 11 while herotates the globe. If the top is true, the pointer will not vary fromline 12 scram but if it does move from the line the globe must berejected, as then the cap would not be held perpendicular to the carbonif the globe were used in a lamp and the carbon would not feed.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. A testing device comprising a frame, a revoluble seat mountedthereon, means for locking the article to be tested in said seat, aplate adapted to rest on the article, and means for indicating theangular position of the plate.

2. A testing device comprising a frame having a base and sides and markson the sides, a revoluble seat mounted on the base, means for lockingthe article to be tested in the seat, and a plate adapted to rest on thearticle and movable on the sides of the frame to cooperate with saidmarks.

3. A testing device comprising a frame having a datum-point thereon, arevoluble seat mounted on the base of the frame, means for locking thearticle to be tested in the seat, a loosely-mounted plate adapted torest on the article and movable on the sides of the frame, and a pointermounted on the plate cooperating with said datum-point.

4. A testing device comprising a frame having a base and sides, arevoluble seat mounted on the base, the supporting-surface of which isperpendicular to one of the sides, means for locking the article to betested in the seat, and a gage loosely mounted on said side of theframe.

5. A testing device comprising a frame having a base and sides, arevoluble seat mounted on. the base, means for locking the article to betested in the seat, a plate adapted to rest on the article and movableon the sides of the frame, and a gage loosely mounted on one of thesides.

6. A device for testing globes, comprising a frame, a rotatableglobe-seat mounted on the base of the frame, a movable plate carried bythe sides of the frame and adapted to rest on the top of the globe, andmeans for indicating whether or not the plate is perpendicular to thesides of the frame.

7. A device for testing globes, comprising a frame having marks thereon,a rotatable globe-seat on the base of the frame, means for locking theglobe-seat against rotation, a plate adapted to rest on the upper end ofthe globe, and an index carried by the plate, said plate and in dcxcooperating with said marks.

In witness whereof I have hereunto set my hand this 28th day ofFebruary, 1903.

HENRY CLINTON SPINNEY.

Witnesses DUGALD McK. McKILLoP, JOHN J. WALKER.

